Dye Remover Composition

ABSTRACT

The present invention provides a dye remover composition performing destaining by the reduction action of a reducing agent, wherein the composition reduces the irritation to a scalp when applied to the scalp and is capable of preventing air oxidation after the destaining treatment. The dye remover composition is used for destaining fiber stained with an oxidation dye including a dye intermediate having an amino group, includes a reducing agent, and performs the destaining of fiber by the reduction action of the reducing agent. The dye remover composition further includes a reducing sugar. Examples of reducing sugar include xylose and dihydroxyacetone.

TECHNICAL FIELD

The present invention relates to a dye remover composition capable ofsuppressing the discoloration of fiber after a destaining treatment.

BACKGROUND ART

A hair dye composition comprising a dye carrier material including, forexample, an oxidation dye and ammonia, and an oxidation agent such ashydrogen peroxide is, known as a typical hair dye composition whichstains fiber such as hair. There is a known dye remover compositionbeing used for destaining fiber stained with the hair dye composition,wherein the dye remover composition includes a reducing agent. The dyeremover composition performs the destaining of fiber by the reductionaction of the reducing agent. With fiber destained with the dye removercomposition, there has been a problem that the rediscoloration of fiber,for example, the blackening of fiber occurs due to air oxidation a fewhours or a few days after destaining. Patent Document 1 discloses a dyeremover composition including α-oxocarboxylic acid. The dye removercomposition prevents the discoloration of fiber due to air oxidationafter the destaining treatment due to the action of α-oxocarboxylicacid.

<Patent Document 1: Japanese Laid-Open Patent Publication No. 11-310521DISCLOSURE OF THE INVENTION

However, α-oxocarboxylic acid in the dye remover composition describedin Patent Document 1, which is included in order to prevent thediscoloration due to air oxidation, is a strong acid. Therefore, the pHof the dye remover composition is maintained low. As a result, there hasbeen a problem that the scalp is irritated at the time of use of the dyeremover composition when the dye remover composition is applied to headhair. If the content of α-oxocarboxylic acid is simply set lower inorder to reduce the irritation, it is impossible to sufficientlysuppress the discoloration of fiber due to air oxidation.

As a result of diligent research, the present inventors achieved thepresent invention by finding that the above described problems can besolved by including a reducing sugar in a dye remover composition when adye intermediate having an amino group is included in an oxidation dye.It is an objective of the present invention to provide a dye removercomposition performing destaining by the reduction action of a reducingagent, wherein the dye remover composition reduces the irritation to ascalp when applied to the scalp and is capable of preventing airoxidation after the destaining treatment.

According to one aspect of the present invention, there is provided adye remover composition which is used in the destaining of fiber stainedwith an oxidation dye including a dye intermediate having an aminogroup, includes a reducing agent, and performs the destaining of fiberby the reduction action of the reducing agent. The dye removercomposition further includes a reducing sugar.

The reducing sugar is preferably a monosaccharide. The monosaccharide ispreferably at least one selected from the group consisting of xylose anddihydroxyacetone. The reducing agent is preferably at least one selectedfrom the group consisting of an ascorbic acid, a thioglycolic acid, acysteine, a mercapto compound, a sulfite, a bisulfite, and athiosulfate.

The dye remover composition preferably further includes a hairpenetrant. The hair penetrant is preferably an aromatic alcohol.Preferably, the reducing sugar is xylose, and the mass ratio of xyloseto the hair penetrant is in the range of 0.1 to 5. Preferably, thecontent of xylose in the dye remover composition is in the range of 0.5to 30% by mass. Moreover, preferably, the reducing sugar isdihydroxyacetone, and the mass ratio of dihydroxyacetone to the hairpenetrant is in the range of 0.05 to 5. Preferably, the content ofdihydroxyacetone in the dye remover composition is in the range of 0.05to 30% by mass.

BEST MODE FOR CARRYING OUT THE INVENTION

The present invention will be described in detail with reference to oneembodiment specific for a dye remover composition hereinafter. The dyeremover composition in the present embodiment is used for the destainingof hair as fiber stained with a hair dye composition. The hair dyecomposition consists of a first agent and a second agent.

<First Agent of Hair Dye Composition>

The first agent of a hair dye composition includes, for example, anoxidation dye and an alkaline agent. The oxidation dye is a compoundcapable of color developing induced by oxidation polymerization by anoxidation agent included in the second agent of the hair dyecomposition, and is categorized as a dye intermediate and a coupler. Theoxidation dye at least includes a dye intermediate, wherein the dyeintermediate has an amino group.

Examples of dye intermediate having an amino group includep-phenylenediamine, toluene-2,5-diamine, N-phenyl-p-phenylenediamine,4,4′-diaminodiphenylamine, p-aminophenol, o-aminophenol,p-methylaminophenol, N,N-bis(2-hydroxyethyl)-p-phenylenediamine,2-hydroxyethyl-p-phenylenediamine, o-chloro-p-phenylenediamine,4-amino-m-cresol, 2-amino-4-hydroxyethyl aminoanisole,2,4-diaminophenol, and the salts thereof. These may be includedsingularly, or two or more may be included in combination.

A coupler develops color by binding to a dye intermediate. Examples ofcoupler include 5-amino-o-cresol, m-aminophenol,5-(2-hydroxyethylamino)-2-methylphenol, m-phenylenediamine,2,4-diaminophenoxyethanol, toluene-3,4-diamine, 2,6-diaminopyridine,diphenylamine, N,N-diethyl-m-aminophenol, phenylmethyl pyrazolone, andthe salts thereof. These may be included singularly, or two or more maybe included in combination. The oxidation dye preferably consists of atleast one selected from the specific examples of dye intermediate and atleast one selected from the specific examples of coupler. In this case,a color tone of hair can be changed in various ways.

The content of oxidation dye in the hair dye composition is preferablyin the range of 0.02 to 25% by mass, and more preferably 0.2 to 15% bymass. If the content of oxidation dye is less than 0.02% by mass, it maybe difficult to obtain a sufficient stainability. Even though thecontent of oxidation dye exceeds 25% by mass, stainability does not makefurther improvement. As a result, the economic efficiency of haircoloring may decrease.

The content of dye intermediate in the hair dye composition ispreferably in the range of 0.01 to 15% by mass, and more preferably 0.1to 10% by mass. If the content of dye intermediate is less than 0.01% bymass, it may be difficult to obtain a sufficient stainability. Eventhough the content of dye intermediate exceeds 15% by mass, stainabilitydoes not make further improvement. As a result, the economic efficiencyof hair coloring may decrease.

The content of coupler in the hair dye composition is preferably in therange of 0.01 to 10% by mass, and more preferably 0.1 to 5% by mass. Ifthe content of coupler is less than 0.01% by mass, it may be difficultto obtain a sufficient stainability. Even though the content of couplerexceeds 10% by mass, stainability does not make further improvement. Asa result, economic efficiency of hair coloring may decrease. The firstagent may arbitrarily include, for example, at least one selected fromthe oxidation dyes and direct dyes described in “The Japanese Standardsof Quasi-Drug Ingredients” (June 1991, Yakujinippo, Ltd.) as dyes otherthan the oxidation dye.

An alkaline agent improves stainability by promoting the action of theoxidation agent included in the second agent of the hair dyecomposition, and by improving the permeability of the dye to hair byswelling hair. Examples of alkaline agent include ammonia, analkanolamine, an organic amine, an inorganic alkali, a basic amino acid,and the salts thereof. Examples of organic amine include2-amino-2-methyl-1,3-propanediol, and guanidine. Examples of inorganicalkali include sodium hydroxide, potassium hydroxide, sodium carbonate,and potassium carbonate. Examples of basic amino acid include arginineand lysine. Example of salt includes an ammonium salt. These may beincluded singularly, or two or more may be included in combination.

The content of alkaline agent is preferably an amount at which the pH ofthe first agent is in the range of 8 to 12. If the pH of the first agentis less than 8, there are cases where the action of hydrogen peroxide,which is included in the second agent as an oxidation agent, is notsufficiently promoted when the first agent is mixed with the secondagent. If the pH of the first agent exceeds 12, it is likely to causeproblems such as damage to hair when the hair dye composition is appliedto hair.

The first agent may arbitrarily include the components included in thesecond agent of the dye remover composition other than the reducingsugar, such as oily ingredients or surfactants. Moreover, the firstagent preferably includes a polymerization inhibitor in order to producepolymers having a low polymerization ratio, which are easily destainedwith the dye remover composition, when the oxidation dye undergoesoxidation polymerization by the oxidation agent. Examples of suchpolymerization inhibitor include an ascorbic acid and a sulfite, whichact as reducing agents. Specific examples of ascorbic acid included inthe first agent are the same as the specific examples of ascorbic acidincluded in the first agent of the dye remover composition. The form ofthe first agent is not specifically limited, and examples may includeliquid, gel, foam, and cream forms. Examples of liquid form includeaqueous solutions, dispersions, and emulsions.

<Second Agent of Hair Dye Composition>

The second agent of a hair dye composition includes an oxidation agent.The oxidation agent decolorizes melanin included in hair, and developscolor by oxidizing an oxidation dye included in the first agent of thehair dye composition. Examples of oxidation agent include potassiumbromate, sodium bromate, sodium perborate, and hydrogen peroxide. Thecontent of oxidation agent in the second agent is preferably 0.1 to15.0% by mass when the total amount of the second agent is set to 100%by mass.

The second agent includes components generally included in the secondagent of an oxidation hair dye composition as components other than theoxidation agent. The second agent may arbitrarily include the componentsincluded in the first agent of the hair dye composition other than theoxidation dye and alkaline agent. When the second agent includeshydrogen peroxide as an oxidation agent, the second agent preferablyincludes a stabilizer in order to suppress the degradation of hydrogenperoxide. Examples of stabilizer include urea, phenacetin, sodiumstannate, ethylene glycol phenyl ether, 8-oxyquinoline, and phosphoricacid. The form of the second agent is not specifically limited, andexamples may include liquid, gel, foam, and cream forms. Examples ofliquid form include aqueous solutions, dispersions, and emulsions.

<Hair Dye Composition>

A hair dye composition is prepared by mixing the first agent and thesecond agent in a predetermined proportion. The form of the hair dyecomposition is not specifically limited, and examples may includeliquid, cream, gel, and foam forms.

Next, the dye remover composition will be described. The dye removercomposition consists of the first agent and second agent.

<First Agent of Dye Remover Composition>

The first agent of a dye remover composition includes a reducing agent,and, for example, may further include at least one selected from thegroup consisting of fumaric acid and a dispersing agent. The first agentis provided in a powder form. The reducing agent reduces polymersproduced by oxidation polymerization of an oxidation dye staining hair.More specifically, the reducing agent can easily depolymerize oroff-resonate polymers having a low polymerization ratio by its reductionaction. Examples of reducing agent include an ascorbic acid, athioglycolic acid, a cysteine, a mercapto compound, a sulfite, abisulfite, and a thiosulfate.

Examples of ascorbic acid include ascorbic acid, erythorbic acid, andthe salts and derivatives thereof. Examples of ascorbate and erythorbateinclude sodium ascorbate, potassium ascorbate, calcium ascorbate,ammonium ascorbate, monoethanolamine ascorbate, diethanolamineascorbate, and sodium erythorbate.

Examples of ascorbic acid derivative and erythorbic acid derivativeinclude disodium ascorbyl sulfate, disodium erythorbyl sulfate,magnesium ascorbyl phosphate, ascorbyl palmitate, ascorbyl stearate,ascorbyl dipalmitate, ascorbyl tetra 2-hexyldecanate, ascorbylmyristate, ascorbyl laurate, ascorbyl acetate, ascorbyl propionate,ascorbyl tartrate, ascorbyl citrate, ascorbyl succinate, ascorbylbenzoate, potassium (ascorbyl/tocopheryl) phosphate, ethyl ascorbicacid, allantoin ascorbate, chitosan ascorbate, methylsilanol ascorbate,ascorbyl tetradecylhexyl, aminopropyl ascorbyl phosphate, ascorbic acidpolypeptide, ascorbyl glucoside, and ascorbyl methylsilanol pectinate.

Examples of thioglycolic acid include thioglycolic acid, athioglycolate, and a thioglycolic acid ester. Examples of thioglycolateinclude ammonium thioglycolate and sodium thioglycolate. Example ofthioglycolic acid ester includes glycerin thioglycolate. Examples ofcysteine include cysteine, cysteine hydrochloride, andN-acetyl-L-cysteine.

Examples of mercapto compound include thioglycerol, thiolactic acid,thiomalic acid, and cysteamine. Examples of sulfite include sulfurousacid, ammonium sulfite, and sodium sulfite. Examples of bisulfiteinclude ammonium hydrogen sulfite and sodium hydrogen sulfite. Examplesof thiosulfate include thiosulfuric acid and sodium thiosulfate. Thesespecific examples of reducing agent may be included singularly, or twoor more may be included in combination.

Among the specific examples of reducing agent, an ascorbic acid ispreferred. An ascorbic acid is excellent in depolymerizing oroff-resonating polymers having a low polymerization ratio. Furthermore,by including an ascorbic acid as a reducing agent, the odor given offfrom the first agent and dye remover composition can be reduced, and thedegree of damage to hair after the destaining treatment can also bereduced.

Fumaric acid suppresses reoxidation of compounds produced bydepolymerization or off-resonance of polymers having a lowpolymerization ratio, and suppresses recoloration of hair. Thedispersing agent suppresses the formation of an agglutination stateformed by, for example, agglutinating an ascorbic acid, and improves thedispersibility of the first agent in the second agent when mixing thefirst agent and second agent of the dye remover composition. Examples ofdispersing agent include a metal salt of stearic acid, talc, crystallinecellulose, low substituted hydroxypropylcellulose, and dextrin. Examplesof metal salt of stearic acid include calcium stearate and magnesiumstearate.

<Second Agent of Dye Remover Composition>

The second agent of a dye remover composition includes a reducing sugar,and is provided in a liquid, gel, or cream form. The reducing sugarprevents the discoloration of hair due to air oxidation after thedestaining treatment. The reducing sugar has an aldehyde group or ketonegroup, wherein the group is free or bound by hemiacetal bond, and hasMaillard reactivity with amino groups of, for example, amino acids orproteins. Examples of reducing sugar include a free monosaccharide, areducing disaccharide, and a reducing oligosaccharide.

Examples of free monosaccharide include a triose, a tetrose, a pentose,a hexose, and a heptose. Examples of triose include glyceraldehyde anddihydroxyacetone. Example of tetrose includes erythrose. Examples ofpentose include ribose, xylose, and arabinose. Examples of hexoseinclude glucose, galactose, mannose, and fructose. Example of heptoseincludes sedoheptulose.

Examples of reducing disaccharide include a homobiose and a heterobiose.Examples of homobiose include maltose, cellobiose, isomaltose, andgentiobiose. Examples of heterobiose include melibiose, lactose,maltulose, and lactulose.

Example of reducing oligosaccharide includes maltotriose, which is adegradation product of starch or glycogen by α-amylase. These specificexamples of reducing sugar may be included singularly, or two or moremay be included in combination. Among these specific examples, a freemonosaccharide is preferred because it has a high discolorationpreventive effect and high reducing power per unit mass. More preferredare xylose and dihydroxyacetone because they have an even higherdiscoloration preventive effect and are readily available.

The content of reducing sugar in the dye remover composition isdetermined by measuring the reducing power of the constituent sugarresidue, more specifically, the reducing terminal group in the reducingsugar molecule (a carbonyl group or functional group which is easilyconverted to a carbonyl group). The content of reducing sugar in the dyeremover composition is also determined by measuring the reducing powerof the reducing sugar per unit mass. When the reducing sugar is apentose such as xylose, the content of reducing sugar is preferably inthe range of 0.5 to 30% by mass, more preferably 1 to 20% by mass, andmost preferably 2 to 10% by mass. If the content of reducing sugar isless than 0.5% by mass, it may be difficult to sufficiently suppress thediscoloration of hair after the destaining treatment. If the content ofreducing sugar exceeds 30% by mass, hair feel may deteriorate by makinghair sticky, for example.

Moreover, when the reducing sugar is a triose such as dihydroxyacetone,the content of reducing sugar is preferably in the range of 0.05 to 30%by mass, more preferably 0.1 to 20% by mass, and most preferably 0.2 to10% by mass. If the content of reducing sugar is less than 0.05% bymass, it may be difficult to sufficiently suppress the discoloration ofhair after the destaining treatment. If the content of reducing sugarexceeds 30% by mass, hair feel may deteriorate by making hair sticky,for example.

The second agent preferably includes a hair penetrant in order toimprove the permeability of the active ingredients of the dye removercomposition such as the reducing sugar to hair. Examples of hairpenetrant include a lower alcohol, a glycol, a glycerin, an aromaticalcohol, ethyl carbitol, phenethyl alcohol, N-methylpyrrolidone,N-ethylpyrrolidone, ethyl carbonate, and propylene carbonate. Examplesof lower alcohol include ethanol and isopropanol. Examples of glycolinclude propylene glycol, 1,3-butylene glycol, isopropylene glycol,hexylene glycol, polyethylene glycol, and polypropylene glycol. Exampleof glycerin includes diglycerin apart from glycerin itself. Examples ofaromatic alcohol include benzyl alcohol and benzyloxy ethanol. These maybe included singularly, or two or more may be included in combination.Among these, an aromatic alcohol is preferred because it has a highpermeability of the active ingredients of the dye remover composition.More preferred are benzyl alcohol and benzyloxy ethanol because they arereadily available.

The content of hair penetrant in the dye remover composition ispreferably in the range of 1 to 30% by mass, more preferably 2 to 20% bymass, and most preferably 3 to 15% by mass. If the content of hairpenetrant is less than 1% by mass, it may be difficult to obtain a hairpenetration promotion effect of the active ingredients of the dyeremover composition. If the content of hair penetrant exceeds 30% bymass, hair feel may deteriorate. It also may lead to a deterioration ofthe stability of the dye remover composition.

In order to obtain a discoloration preventive effect by a synergeticeffect of the reducing sugar and hair penetrant, when the reducing sugaris xylose, the ratio of xylose to hair penetrant in the dye removercomposition is preferably in the range of 1:0.1 to 1:5, more preferably1:0.1 to 1:3, and most preferably 1:0.2 to 1:2. If the ratio of xyloseto hair penetrant is 1:0.1 to 1:5, the mass ratio of xylose to hairpenetrant is in the range of 0.1 to 5.

Similarly, when the reducing sugar is dihydroxyacetone, the ratio ofdihydroxyacetone to hair penetrant in the dye remover composition ispreferably in the range of 1:0.05 to 1:5, more preferably 1:0.05 to 1:3,and most preferably 1:0.1 to 1:2. If the ratio of dihydroxyacetone tohair penetrant is 1:0.05 to 1:5, the mass ratio of dihydroxyacetone tohair penetrant is in the range of 0.05 to 5. In the specific examples ofreducing sugar other than xylose and dihydroxyacetone, the ratio ofreducing sugar to hair penetrant is determined by measuring the reducingpower of the constituent sugar residue (the reducing terminal group inthe reducing sugar molecule) or the reducing power of the reducing sugarper unit mass.

The second agent may include at least one selected from the groupconsisting of, for example, water, a water soluble high polymercompound, a surfactant, an oily ingredient, a polyhydric alcohol, anantiseptic agent, a chelating agent, a stabilizing agent, a pH adjuster,a plant extract, a herbal extract, a vitamin, a fragrant material, andultraviolet absorbing agents according to need.

Water functions as a solubilizing agent for the reducing agent. A watersoluble high polymer compound functions as a viscosity improver, whichgives a suitable viscosity to the dye remover. Examples of water solublehigh polymer compound include Arabian gum, karaya gum, gum tragacanth,alginate sodium, xanthan gum, a cellulose derivative, crosslinkedpolyacrylic acid, and polychlorinated dimethylmethylene piperidium.

An oily ingredient provides moisture to hair. Therefore, the secondagent preferably includes an oily ingredient. Examples of oilyingredient include a fat, a wax, a higher alcohol, a hydrocarbon, ahigher fatty acid, an alkyl glyceryl ether, an ester, and a silicone.

Examples of fat include olive oil, camellia oil, shea butter, almondoil, tea seed oil, camellia sasanqua oil, safflower oil, sunflower oil,soybean oil, cottonseed oil, sesame oil, beef tallow, cacao butter, cornoil, peanut oil, rapeseed oil, rice bran oil, rice germ oil, wheat germoil, coix lacryma-jobi seed oil, grape seed oil, avocado oil, carrotoil, macadamia nut oil, castor oil, flaxseed oil, coconut oil, mink oil,and egg yolk oil. Examples of wax include beeswax, candelilla wax,carnaiba wax, jojoba oil, and lanolin.

Examples of higher alcohol include lauryl alcohol, myristyl alcohol,cetyl alcohol (cetanol), stearyl alcohol, cetostearyl alcohol, arachylalcohol, behenyl alcohol, 2-hexyldecanol, isostearyl alcohol,2-octyldodecanol, decyltetradecanol, oleyl alcohol, linoleyl alcohol,linolenyl alcohol, and lanolin alcohol.

Examples of hydrocarbon include α-olefin oligomer, light isoparaffin,light liquid isoparaffin, synthetic squalane, vegetable squalane,squalane, polybutene, liquid isoparaffin, liquid paraffin, ozokerite,ceresin, paraffin, polyethylene powder, microcrystalline wax, andvaseline.

Examples of higher fatty acid include lauric acid, myristic acid,palmitic acid, stearic acid, behenic acid, isostearic acid,hydroxystearic acid, 12-hydroxystearic acid, oleic acid, undecylenicacid, linoleic acid, ricinoleic acid, and lanolin fatty acid. Examplesof alkyl glyceryl ether include batyl alcohol (monostearyl glycerylether), chimyl alcohol (monocetyl glyceryl ether), selachyl alcohol(monooleyl glyceryl ether), and isostearyl glyceryl ether.

Examples of ester include diisopropyl adipate, diisobutyl adipate,dioctyl adipate, 2-hexyldecyl adipate, diisostearyl adipate, isopropylmyristate, cetyl octanoate, cetyl isooctanoate, isononyl isononanoate,isodecyl isononanoate, isotridecyl isononanoate, diisopropyl sebacate,octyldodecyl myristate, isopropyl palmitate, butyl stearate, stearylstearate, hexyl laurate, myristyl myristate, decyl oleate, hexyldecyldimethyl octanoate, triisodecyl myristate, isostearyl myristate,2-ethylhexyl palmitate, octyldodecyl ricinoleate,(cholesteryl/lanosterol) fatty acid ester (C10 to 30), lauryl lactate,cetyl lactate, myristyl lactate, octyldodecyl lactate, acetylatedlanolin, isocetyl stearate, isocetyl isostearate, 12-cholesterylhydroxystearate, di-2-ethyleneglycol ethyl hexanoate, dipentaerythritolfatty acid ester, N-alkylglycol monoisostearate, cetyl caprate, glyceryltricaprylate, neopentyl glycol dicaprate, diisostearyl malate, and alanolin derivative.

Examples of silicone include dimethyl polysiloxane, methylphenylpolysiloxane, decamethylcyclopentasiloxane,dodecamethylcyclohexasiloxane, polyether modified silicone, highlypolymerized silicone having an average degree of polymerization of 650to 10,000, amino modified silicone, betaine modified silicone, alkylmodified silicone, alkoxy modified silicone, mercapto modified silicone,carboxy modified silicone, and fluorine modified silicone. Thesespecific examples of oily ingredient may be included singularly, or twoor more may be included in combination.

Examples of polyhydric alcohol include a glycol and a glycerine.Examples of glycol include ethylene glycol, diethylene glycol,triethylene glycol, propylene glycol, dipropylene glycol, isopreneglycol, and 1,3-butylene glycol. Examples of glycerine includeglycerine, diglycerine, and polyglycerine.

A surfactant maintains the stability of the first agent of the dyeremover composition as an emulsifying agent or solubilizing agent.Examples of surfactant include a nonionic surfactant, a cationicsurfactant, an anionic surfactant, and an ampholytic surfactants.

Examples of nonionic surfactant include a polyoxyethylene (referred toas POE hereinafter) alkyl ether, a POE alkyl phenyl ether, a POEpolyoxypropylene alkyl ether, a POE sorbitan fatty acid ester, a POEpropylene glycol fatty acid ester, and an aliphatic alkanolamide.

Examples of cationic surfactant include lauryltrimethylammoniumchloride, cetyltrimethylammonium chloride, stearyltrimethylammoniumchloride, behenyltrimethylammonium chloride, distearyldimethylammoniumchloride, cetyltrimethylammonium bromide, stearyltrimethylammoniumbromide, behenyltrimethylammonium methylsulfate,stearyltrimethylammonium saccharin, and cetyltrimethylammoniumsaccharin.

Examples of anionic surfactant include an alkyl sulfate, a POE alkylsulfate, an alkyl sulfate ester salt, sodium methyl stearoyl taurate,triethanolamine dodecylbenzenesulfonate, sodium tetradecene sulfonate,POE laurylether phosphate and the salt thereof, N-lauroyl glutamate, andN-lauroylmethyl-β-alanine. Example of alkyl sulfate includes sodiumlauryl sulfate. Example of POE alkyl sulfate includes sodium POE laurylether sulfate. Example of alkyl sulfate ester salt includestriethanolamine lauryl sulfate.

Examples of ampholytic surfactant include sodium2-undecyl-N-carboxymethyl-N-hydroxyethyl imidazolinium betaine,cocamidopropyl betaine, and lauryl dimethylaminoacetic betaine.

Example of antiseptic agent includes paraben. Example of chelating agentincludes disodium ethylenediaminetetraacetate (EDTA-2Na). Examples ofstabilizing agent include phenacetin, 8-hydroxyquinoline, acetanilide,sodium pyrophosphate, barbituric acid, uric acid, and tannic acid.Examples of pH adjuster include phosphoric acid, citric acid, sulfuricacid, acetic acid, lactic acid, tartaric acid, and malic acid.

<Dye Remover Composition>

A dye remover composition is prepared by mixing the first agent andsecond agent in a predetermined proportion. In doing so, the reducingagent in the first agent is dissolved in the second agent. The dyeremover composition is applied to hair stained by color development ofpolymers produced by oxidation polymerization of the oxidation dye byusing an applicator such as brush or comb. In doing so, polymersstaining hair are depolymerized (degraded) or off-resonated by thereduction action of the reducing agent. After the destaining treatment,the oxidation dye, which is converted to monomers or lower molecularweight substances, derived from the hair dye composition remains inhair. The reducing sugar in the dye remover composition suppressesoxidation polymerization of the oxidation dye due to air oxidation. As aresult, the discoloration of hair is suppressed. More specifically,Maillard reaction occurs, wherein an amino group of the dye intermediateremaining in hair and an aldehyde group or keto group of the reducingsugar are bound. As a result, repolymerization of the dye intermediatedue to air oxidation is suppressed, resulting in suppression of thediscoloration of hair.

Advantages exerted by the present embodiment will be describedhereinafter.

(1) In the present embodiment, the dye remover composition, which isapplied to hair stained with an oxidation dye including a dyeintermediate having an amino group, includes a reducing sugar.Therefore, it is possible to prevent air oxidation after the destainingtreatment. More specifically, by binding an amino group of the dyeintermediate remaining in hair, wherein the intermediate is converted tomonomers or lower molecular weight substances, with an aldehyde group orketo group of the reducing sugar after the destaining treatment,repolymerization (discoloration) of the dye intermediate due to oxygenin the air is suppressed.

(2) The dye remover composition of the present embodiment includes aneutral reducing sugar instead of strong acid α-oxocarboxylic acid.Therefore, when the dye remover composition is applied to the scalp, itis possible to reduce the irritation to the scalp.

(3) In the present embodiment, when a monosaccharide is used as thereducing sugar, the advantages of the present invention are exerted byusing a small amount of reducing sugar. This is because the reducingpower of the constituent sugar residue or the reducing power per unitmass of the monosaccharide is higher than the reducing power of theconstituent sugar residue or the reducing power per unit mass ofreducing disaccharides or reducing oligosaccharide. For example,maltose, which is a reducing disaccharide, has two glucose molecules asthe constituent sugars, namely, which compose maltose, wherein areducing terminal group of one of the two glucose molecules is used forbinding. Accordingly, maltose only has one reducing terminal group.Therefore, in comparison with glucose, which is a monosaccharide, thereducing power of the constituent sugar residue or the reducing powerper unit mass of maltose is approximately half. In order to obtain thereducing power equivalent to that of glucose, which is a monosaccharide,with maltose, approximately double as much as glucose (% by mass) isrequired.

(4) In the present embodiment, when at least one selected from the groupconsisting of xylose and dihydroxyacetone is used as the reducing sugar,the advantages of the present invention are exerted by using a smallamount of reducing sugar. This is because the reducing power of xyloseand dihydroxyacetone per unit mass is higher than the reducing power ofhexoses and heptoses per unit mass. Moreover, xylose and hydroxyacetoneare inexpensive and readily available in comparison with othermonosaccharides.

(5) In the present embodiment, when at least one selected from the groupconsisting of an ascorbic acid, a thioglycolic acid, a cysteine, amercapto compound, a sulfite, a bisulfite, and a thiosulfate is used asthe reducing agent, the destaining operation is easily performed. Thisbecause the reducing agent is excellent in depolymerizing oroff-resonating polymers having a low polymerization ratio.

(6) When the dye remover composition of the present embodiment includesa hair penetrant, the permeability of the reducing sugar to hair isimproved, and discoloration preventive effect is further improved.

(7) When xylose is used as the reducing sugar in the present embodiment,by setting the content of xylose in the dye remover composition to therange of 0.5 to 30% by mass, the deterioration of hair feel by makinghair sticky, for example, is suppressed, and the discoloration of hairafter the destaining treatment is sufficiently suppressed.

(8) When dihydroxyacetone is used as the reducing sugar in the presentembodiment, by setting the content of dihydroxyacetone in the dyeremover composition to the range of 0.05 to 30% by mass, thedeterioration of hair feel by making hair sticky, for example, issuppressed, and the discoloration of hair after the destaining treatmentis sufficiently suppressed.

The following modifications may be made in the above embodiment.

In the above embodiment, the dye remover composition is applied to headhair. However, the dye remover composition may be applied to fiber otherthan head hair, which can be stained by an oxidation dye, such as humanhair other than head hair, sheep wool, and feather. In such case, airoxidation after the destaining treatment can be prevented.

The dye remover composition of the above embodiment consists of thefirst agent and second agent, and the first agent and second agent aremixed immediately prior to the use of the dye remover composition.However, the dye remover composition may be composed of a singleformulation consisting of a solution including all the componentsincluded in the dye remover composition. Moreover, the dye removercomposition may be applied to hair after preparing a dye removercomposition by dissolving components in a solid form such as a reducingagent and reducing sugar in water by a user who uses the dye removercomposition. Examples of reducing agent in a solid form include anascorbic acid in a powder form. The dye remover composition may becomposed of triple formulation or more by arbitrarily separating thecomponents composing the first agent and second agent of the dye removercomposition. For example, the reducing sugar may be excluded from thefirst agent and second agent. After mixing the first agent and secondagent to prepare the dye remover composition, the reducing sugar may beadded to the mixture thereof.

In the above embodiment, The reducing sugar may be included in the firstagent of the dye remover composition instead of the second agent of thedye remover composition.

The hair dye composition of the above embodiment consists of the firstagent and second agent, and the first agent and second agent are mixedimmediately prior to the use of the hair dye composition. However, thehair dye composition may be composed of triple formulation or more byarbitrarily separating the components composing the first agent andsecond agent of the hair dye composition. For example, the hair dyecomposition may be composed of the first agent including an oxidationdye including a dye intermediate having an amino group, the second agentincluding an alkaline agent, and the third agent including an oxidationagent. In this composition, since the oxidation dye is separated fromthe alkaline agent, the storage stability of the oxidation dye isimproved. Moreover, all the components composing the hair dyecomposition may be separated, and the components may be mixedimmediately prior to the use of the hair dye composition.

In the above embodiment, the first agent of the dye remover compositionis provided in a powder form in order to improve the stability of thereducing agent. However, the form of the first agent is not specificallylimited, and the first agent may be provided in a liquid, gel, or creamform by including a solvent such as water in the first agent.

Examples

Next, the above embodiment will be described in further detail withreference to Examples and Comparative Examples.

The first agent and second agent of the hair dye composition wereprepared, wherein the agents included the components shown in Table 1.The value in the column representing each component in Table 1 is thecontent of the component in the corresponding column, and the unit is %by mass. Subsequently, the hair dye composition was prepared by mixingthe first agent and second agent at 1:1 mass ratio. The obtained hairdye composition was applied to a medium brown human hair bundle(referred to simply as a hair bundle hereinafter) by using a brush, andleft to stand for 30 minutes at room temperature (25° C.). Next, afterthe hair dye composition adhered to the hair bundle was washed withwater, the hair bundle was subjected to shampoo twice, and hairconditioner was applied to the bundle once. Subsequently, the hairbundle was left to stand for a day after being dried with warm air.

TABLE 1 <First agent> 28% Ammonia water 5 Ascorbic acid 0.5 Sodiumsulfite 0.2 Sodium lauryl sulfate 2 Stearyl alcohol 10 POE(30) stearylether 10 Disodium EDTA 0.5 Paraphenylenediamine 0.52,4-diaminophenoxyethanol 1 hydrochloride Purified water Residualquantity Total 100 <Second agent> 35% Hydrogen peroxide 16 Sodiumstannate 0.1 EDTA 0.5 Cetanol 5 Sodium lauryl sulfate 1 Purified waterResidual quantity Total 100

Moreover, the first agent and second agent of the dye removercomposition were prepared, wherein the agents included the componentsshown in Table 2. The value in the column representing each component inTable 2 is the content of the component in the corresponding column, andthe unit is % by mass. Subsequently, the dye remover composition wasprepared by mixing the first agent and second agent at 1:10 mass ratio.The obtained dye remover composition was applied to the hair bundletreated with the above mentioned staining treatment by using a brush,and left to stand for 30 minutes at room temperature (25° C.).

Next, after the dye remover composition adhered to the hair bundle waswashed with water, the hair bundle was subjected to shampoo twice, andhair conditioner was applied to the bundle once. The bundle was thendried with warm air. Subsequently, the L*a*b* value (L₁, a₁, and b₁) wasmeasured for the hair bundle treated with the destaining treatment byusing a spectral photometer (Minolta Co., Ltd., Model number: CM-508d).The pH of the second agent and dye remover composition in each exampleshown in Table 2 was also measured.

<Air Reoxidation Rate>

After the hair bundle treated with the above described destainingtreatment was left to stand for 24 hours in a temperature controlledbath at 40° C., the L*a*b* value (L₂, a₂, and b₂) was measured by usingthe spectral photometer.

From the L*a*b* values of an untreated hair bundle, the hair bundletreated with the destaining treatment, and the hair bundle after theisothermal treatment, respectively, the color difference (ΔE₁) betweenthe untreated hair bundle and the hair bundle treated with thedestaining treatment, and the color difference (ΔE₂) between theuntreated hair bundle and the hair bundle after the isothermal treatmentwere calculated by the following formula (1).

ΔE _(i)={(L _(i) −L ₀)²+(a _(i) −a ₀)²+(b _(i) −b ₀)²}^(1/2)  (1)

In the formula (1), L_(i) refers to the L* value of the hair bundleafter the destaining treatment or the hair bundle after the isothermaltreatment, a_(i) refers to the a* value of the hair bundle after thedestaining treatment or the hair bundle after the isothermal treatment,b_(i) refers to the b* value of the hair bundle after the destainingtreatment or the hair bundle after the isothermal treatment, and L₀, a₀,and b₀ refer to the L* value, a* value and b* value for the untreatedhair bundle, respectively.

Next, from ΔE₁ and ΔE₂, the air reoxidation rate [%] was calculated bythe following formula (2).

Air reoxidation rate [%]=(1−ΔE ₁ /ΔE ₂)×100  (2)

The lower the air reoxidation rate, the less the discoloration of hairin the isothermal treatment becomes. The calculation results of airreoxidation rate in each example are shown in Table 2.

<Sensory Irritation>

The dye remover composition of each Example and Comparative Example wasapplied to the upper arm of each of five panelists. At 10 minutes afterapplication, sensory evaluation for irritation felt by each panelist wasperformed in the following score of one to three. More specifically,irritation felt by the panelists was scored according to the followingscores; 3 (when no irritation felt by the panelists), 2 (when weakirritation such as weak pain and slight smarting felt by the panelists),and 1 (when strong irritation such as strong pain and smarting felt bythe panelists). The average score of the results of scoring by the 5panelists was calculated. Subsequently, as the evaluation of sensoryirritation, it was defined “favorable” when the average score calculatedwas 2.6 or more, “somewhat bad” when the average score calculated wasfrom not less than 1.6 to not more than 2.5, and “bad” when the averagescore calculated was 1.5 or less. The evaluation results are shown inTable 2.

TABLE 2 Comparative Comparative Comparative Comparative Example 1Example 2 Example 3 Example 4 Example 1 Example 2 Example 3 Example 4First (Reducing agent) 100 100 100 100 100 100 100 100 agent Ascorbicacid Second (Hair penetrant) — 9 9 9 9 9 9 9 agent Benzyl alcohol Lacticacid 2 2 2 2 2 2 2 2 (Hair penetrant) 10 10 10 10 10 10 10 10 95%Ethanol Xanthan gum 1 1 1 1 1 1 1 1 (Reducing sugar) 5 5 — — — — — —Xylose (Reducing sugar) — — 5 — — — — — Glucose (Reducing sugar) — — — 5— — — — Dihydroxyacetone Trehalose — — — — — 5 — — Glyoxalic acid (a- —— — — — — 5 0.5 oxocarboxylic acid) Purified water Residual ResidualResidual Residual Residual Residual Residual Residual quantity quantityquantity quantity quantity quantity quantity quantity Total 100 100 100100 100 100 100 100 Air reoxidation rate 3 0.1 3.3 0 11.8 9.3 0.2 7.1 pHof second agent of 3 3 3 3 3 3 1.9 2.6 dye remover composition pH of dyeremover 2.7 2.7 2.7 2.7 2.7 2.7 1.6 2.2 composition Sensory irritationFavorable Favorable Favorable Favorable Favorable Favorable Bad Somewhatbad

From the results shown in Table 2, it was found out that the pH of thedye remover compositions in Examples 1 through 4, wherein the secondagents included xylose, glucose, or dihydroxyacetone as a reducingsugar, was higher than the pH of the dye remover compositions inComparative Examples 3 and 4, because the dye remover compositions inExamples 1 through 4 did not include glyoxalic acid (α-oxocarboxylicacid). Therefore, the evaluation of sensory irritation was maintained“favorable” with the dye remover compositions in Examples 1 through 4.Furthermore, the air reoxidation rate was maintained low by the reducingsugar as well as that the evaluation of sensory irritation wasmaintained “favorable” with the dye remover compositions in Examples 1through 4. The air reoxidation rate of the dye remover composition inExample 2, wherein the second agent included benzyl alcohol as a hairpenetrant, was maintained lower, in comparison with the air reoxidationrate of the dye remover composition in Example 1.

On the other hand, it was found out that the air reoxidation rate couldnot be maintained low with the dye remover composition in ComparativeExample 1, wherein the composition did not include a reducing sugar, andthe dye remover composition in Comparative Example 2, wherein thecomposition included trehalose instead of a reducing sugar. With the dyeremover composition in Comparative Example 3, wherein the compositionincluded glyoxalic acid, although the air reoxidation rate wasmaintained low, the evaluation of sensory irritation could not bemaintained favorably. When the content of glyoxalic acid was reduced, incomparison with Comparative Example 3, in Comparative Example 4 in orderto reduce the sensory irritation, the air reoxidation rate becamehigher, in comparison with Comparative Example 3. Therefore, it wasfound out that glyoxalic acid could not reduce the air reoxidation rateat the same time as it reduced the sensory irritation.

1. A dye remover composition used for destaining fiber stained with anoxidation dye including a dye intermediate having an amino group, thedye remover composition comprising: a reducing agent, wherein the dyeremover composition performs the destaining of fiber by the reductionaction of the reducing agent; and a reducing sugar, wherein the reducingagent is at least one selected from the group consisting of an ascorbicacid, a thioglycolic acid, a cysteine, a mercapto compound, a sulfite, abisulfite, and a thiosulfate.
 2. The dye remover composition accordingto claim 1, wherein the reducing sugar is a monosaccharide.
 3. The dyeremover composition according to claim 2, wherein the monosaccharide isat least one selected from the group consisting of xylose anddihydroxyacetone.
 4. (canceled)
 5. The dye remover composition accordingto claim 1, further comprising a hair penetrant.
 6. The dye removercomposition according to claim 5, wherein the hair penetrant is anaromatic alcohol.
 7. The dye remover composition according to claim 5,wherein the reducing sugar is xylose, and the mass ratio of xylose tothe hair penetrant is in the range of 0.1 to
 5. 8. The dye removercomposition according to claim 1, wherein the reducing sugar is xylose,and the content of xylose in the dye remover composition is in the rangeof 0.5 to 30% by mass.
 9. The dye remover composition according to claim5, wherein the reducing sugar is dihydroxyacetone, and the mass ratio ofdihydroxyacetone to the hair penetrant is in the range of 0.05 to
 5. 10.The dye remover composition according to claim 1, wherein the reducingsugar is dihydroxyacetone, and the content of dihydroxyacetone in thedye remover composition is in the range of 0.05 to 30% by mass.